Raymond Mill's development history presentation

Time: 2015-01-26

CVGrueber created in 1906 in the southern suburbs of Berlin, Curt Von Grueber machinery factory, using his acquired US patent Maxecon's first mill to produce, and for the MOABIT station in Berlin BEWAG as coal grinding equipment, grinding energy of up to 5T / H, a few years sold nearly 600 units, respectively, applied to the grinding areas of different industries. BEWAG period for the proposed coal mill higher yields. After ECLoesche shares and director Curt Von Grueber machinery factory decided to buy raymond centrifugal US patent discloses a ring roller mill, Raymond mill produced the first generation system. The structure was erected in the center of the machine with a rotating spindle belt holder plum, plum rack hanging three or more of the roller rotation axis of rotation at a constant speed of rotation of the roller drive swing outward, and in the centrifugal force of the driving under the pressure mounted on the cylinder wall to wear rings. When grinding the material into the area under the roller guide plow blade material beneath role was brought to the front area of the roller. Because Raymond coal mill roller mill grinding force (centrifugal force) is restricted grinding roll diameter and speed of the mill at the time only applies to soft, low ash and grindability good coal quality materials, and Germany coal hard, and high ash content, you need a higher grinding force, Raymond coal mill grinding of this structure is difficult to meet the requirements, so Raymond coal mill in Germany has not been universal. And then just for the United States Raymond coal mill grinding coal quality requirements, so Raymond coal mill was in the United States has been widely promoted and applied.

 

1925 ECLoesche summarizes the characteristics and structure of the first generation of the drawbacks of using coal mill Raymond, decided to further improve the structure of Raymond mill, developed a theory and that the opposite grinding mill, called the Modified Raymond. The main structural feature is a bowl-shaped rotary grinding ring, roller using mechanical spring load pressure grinding force increases, the material is fed from the center grinding bowl into the ring by rotating centrifugal mill rolls. Grinding roller rocker arm shaft is fixed on a one-way activity, each arm can be adjusted by controlling the grinding force of the spring. This improved Raymond ventilation systems have positive and negative pressure blowing straight in two ways. This type of Raymond patent soon to be US Combustion Engineering (Combustion Engineering) purchased. Raymond still exists due to improved ring roller mill problem, although a slight increase in the roll diameter, but not increase the grinding force. Later, the US subsidiary Combustion Engineering Raymond and on this basis to develop a new generation of Raymond, called VR mill. In many respects this Raymond Loesche mill structures are similar. It is worth noting that it is different from Loesche mill grinding roller cone and flat disc, using a cylindrical grinding roller and grinding disc surface tilt angle of 15 degrees with use. Loesche mill roller mill has a similar mill rolls during inspection and maintenance pulls device, and is also equipped with protective devices to prevent the metal contact between the roller and the disc. Also before the start grinding roller mill can lift in advance, so you can reduce the starting torque of the motor. Raymond industrial applications in the United States, is often used to prepare coal, changes in product fineness between 250-325 mesh, adjustable work product fineness and yield during operation.